Smoke Alarm, 1.9 in H, 5.6 in W

Smoke Alarm, Battery Chemistry Alkaline, Battery Location Side, Battery Locking Pin Yes, Battery Size 9V, Communication Protocol Hardwired, Compatible With 1039102, 7010, 7010B, 7010BSL, 7020B, 7020BSL, 7030BSL, 9120, 9120B, HD6135FB, RM4 (Relay Modules), SA520, SC7010B, SC7010BV, SC9120B, SM100V-AC, SM300-AC, SM500-AC, SMCO100V-AC, SMI100-AC, SMI105-AC and BRK Smoke Alarm Models 3120B, SMI110LED-AC, SMICO100-AC, SMICO105-AC, SMICO110LED-AC, Detector Type Smoke Detector